Process of treating barium chlorid and strontium chlorid for producing chlorin and hydroxid of the said metals.



- obtained into Md. a.

ADQLF CLEMM, OF MANNHEIM, GERMANY.

TREATING- BLAEIUM Cl-ILORID AND STRQNTIUM CHLOBID F03 PEEODUCING Alill? HYDRGXID OF THE SAID METALS.

Specification of Letters Patent. Patented Get. 18, 1291i},

Application. filed March it, 1910. Serial No. 5%,?!2.

To all whom it may concern:

llc it .litnown thet l, Anoiii CLEMM, a subject of the Gei'n'ian Emperor, and resident at lti'nnnheini, Germany, have invented cer tain. new and useful improvements in lrocesses of Treating Barium (lhloiid end Strontium Chlorid for Producing Chlorin and Hydroxide of the Suidhietals, of which the following is a spwilicetion.

My invention relates to improvements in i1 process of treating barium chlorid end strontium chloi'id for producing chlorin and hydroxide oi the said metals.

l oi' melting hyili'oxids of alkaline earths easily be obtained in a, trifu'gul action and washing. During the electrolysis gaseous chloriu is simultaneously formed which is collected and used for any desired purpose. The liquid resulting from the said operation contains slight quantities of hydroxid which is turned back with the chloi'id into the process, or it can be deposited in the form of pure carbonate by means of cai'honicacid.

The process may he termeda process of a partial electrolysis, and in the first stage of the said process substantially equivalent amounts of hydroxid'ond chlorin are neopni-c state by cennunierous nocesses have been suggested and duced. The amounts of chloiids of elka line many patents have been granted H1 which earths which were not decomposed and the ssh processes ei'coesci'ihed, and men oi remaining small quantity of hydioxld con mined therein are turned back into the process, provided the said hydroxid is not precipitsted before the solution, from which the hydroxid and the chlorin were separated has been brought to its originsl concentration by evaporation or by dissolving therein solid chlorid.

.iis the solubility of the hydroxid of the two alkaline earths is considerably larger at high ten'iperatures than at low tempera tures, the cathode liquid is preferably heated during the electrolysis, as is done in the electrolysis of the allmlies because in this case the decomposition can he cer'i-ied sonicthese processes relate to producing barium hydroxid. (irenerally speaking-two different ways have been suggested for producing the said hydroxids. {inc of these ways consists in mixing the ceachonetes (which may be either natural carbonates of carbonates 1 l which are obtained by reducing, sulistes by means of coal and treating the product with carbonic acid), with cool and ho sting the some to intense red heat, whereupon the hydroxid is obtained by washing the product with Willfil. A second way consists in reducing the sulfates by nesting the same with cool and transitioning the sullid thus metallic sulfid end hydroxid by means of a metallic oxid. Furthermore, eliorts have been made to produce hydr Kid. by heating sulfate with coal and calcium carbonate and liisivisting the hydioxid obtained.

My invention consists in producing the aforesaid hydroxide from their chloride, 'hy decomposing the same by electrolysis into gaseous chloi'in and into hydroxid, the latter being produced in e specie]. way.

By my experiments I have discovered that when the electrolytic decomposition is carried to that point only where the chlorid compound stated above, at a temperature of from to degrees centigrede to from (30 to 70 grains of barium hydroxid in one liter).

Notwithstanding the partial decomposition occurring in the process, the latter can he made e continuous process of producing chlorin and hydroxid, if at one side of the baths the chlorid solution which is elec" ti'olyzed in the critical point is slowly or at intervals Witl'idrewn, while at gosite side of the baths a corresponding amount, of the solution of the chlorid is adsolution is nearly sstur'ted with the 'nyinittcdi droxid (which is for 3"llil'ii')lfi the case when Foi the purpose of ()ill-Etllllllg gaseous chlorin and hydmniiid oi barium or strontium the process docifihcd may he uiodiliml melting {no of chloi'ids oi? sillmlics and M tin il i'l'i'ol ilc M m! ll (lllfillil of 'fi:- tlml i l mi 3 h di'oxid v ml clectrolyzing :itui'e ojtiifi'oin 530 to Q with on amount oi lmi'iuni hyijlionid when the soiut on (no il tho i cerium china-id at it ten:

whet farther (in the example of the bni'iuni he opscribed above by crystallization etc;

The process may be carried on in any well I claim:

1. The herein described process of producing chlorinand an hydroxid of an alkaline earth metal which comprises subjecting a solution of a chlorid of an alkaline earth metal to electrolysis until the chlorid solution is nearly saturated with the hydroxid,

- 2. The herein described'process of producing chlorin and an hydroxid of an alkaline earth metal which comprises subjecting a solution of a chlorid of an alkaline earth metal to electrolysis until the chlorid solution is nearly saturated with the hydroxid,

' known apparatus and even in a simple cell.

and gradually withdrawing the solution which is saturated with the hydroxid.

3. The herein described process of treating an alkaline earth metal chlorid for producing chlorin and the corresponding rhyiiroxid by electrolysis, which comprises subjecting the solution of such chlorid to a partial electrolysis until the solution of the chlorid is nearly saturated, with the corresponding hydroxid, withdrawing the solution, and'cooling and thereby crystallizing the hydroxid. Y

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

' ADOLF CLEMM. Witnesses:

ERNEST L. Ives, W. W. SoHMm'r.

the withdrawn solution 

